// code placeholder
java.lang.NullPointerException
 at org.csanchez.jenkins.plugins.kubernetes.KubernetesSlave._terminate(KubernetesSlave.java:223)
 at hudson.slaves.AbstractCloudSlave.terminate(AbstractCloudSlave.java:67)
 at hudson.slaves.AbstractCloudComputer.doDoDelete(AbstractCloudComputer.java:63)
 at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
 at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)
 at org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:77)
 at org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)
 at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)
 at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)
 at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)
 at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
 at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
 Caused: javax.servlet.ServletException
 at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:765)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
 at org.kohsuke.stapler.MetaClass$10.dispatch(MetaClass.java:374)
 at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
 at org.kohsuke.stapler.MetaClass$3.doDispatch(MetaClass.java:209)
 at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
 at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
 at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
 at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
 at org.jenkinsci.plugins.RefreshFilter.doFilter(RefreshFilter.java:96)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
 at org.jenkinsci.plugins.ssegateway.Endpoint$SSEListenChannelFilter.doFilter(Endpoint.java:225)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
 at io.jenkins.blueocean.auth.jwt.impl.JwtAuthenticationFilter.doFilter(JwtAuthenticationFilter.java:61)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
 at io.jenkins.blueocean.ResourceCacheControl.doFilter(ResourceCacheControl.java:134)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
 at jenkins.metrics.impl.MetricsFilter.doFilter(MetricsFilter.java:125)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
 at hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:59)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:151)
 at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:157)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:99)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
 at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
 at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
 at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90)
 at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
 at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
 at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
 at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
 at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
 at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
 at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
 at org.eclipse.jetty.server.Server.handle(Server.java:564)
 at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:317)
 at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
 at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
 at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
 at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
 at org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:128)
 at org.eclipse.jetty.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222)
 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294)
 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:199)
 at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)

// code placeholder
Local headers refused by remote: Unknown client name: npm-gsv43
 Oct 01, 2018 10:57:58 AM hudson.remoting.jnlp.Main$CuiListener status
 INFO: Protocol JNLP4-connect encountered an unexpected exception
 java.util.concurrent.ExecutionException: org.jenkinsci.remoting.protocol.impl.ConnectionRefusalException: Unknown client name: npm-gsv43
 at org.jenkinsci.remoting.util.SettableFuture.get(SettableFuture.java:223)
 at hudson.remoting.Engine.innerRun(Engine.java:609)
 at hudson.remoting.Engine.run(Engine.java:469)
 Caused by: org.jenkinsci.remoting.protocol.impl.ConnectionRefusalException: Unknown client name: npm-gsv43
 at org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer.newAbortCause(ConnectionHeadersFilterLayer.java:378)
 at org.jenkinsci.remoting.protocol.impl.ConnectionHeadersFilterLayer.onRecvClosed(ConnectionHeadersFilterLayer.java:433)
 at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:832)
 at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:287)
 at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:172)
 at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:832)
 at org.jenkinsci.remoting.protocol.NetworkLayer.onRecvClosed(NetworkLayer.java:154)
 at org.jenkinsci.remoting.protocol.impl.BIONetworkLayer.access$1500(BIONetworkLayer.java:48)
 at org.jenkinsci.remoting.protocol.impl.BIONetworkLayer$Reader.run(BIONetworkLayer.java:247)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at hudson.remoting.Engine$1$1.run(Engine.java:94)
 at java.lang.Thread.run(Thread.java:748)
 Suppressed: java.nio.channels.ClosedChannelException
 ... 7 more